400442664 has 16 divisors (see below), whose sum is σ = 1001106720. Its totient is φ = 133480880.

The previous prime is 400442659. The next prime is 400442671. The reversal of 400442664 is 466244004.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8342532 + ... + 8342579.

It is an arithmetic number, because the mean of its divisors is an integer number (62569170).

Almost surely, 2^400442664 is an apocalyptic number.

It is an amenable number.

400442664 is an abundant number, since it is smaller than the sum of its proper divisors (600664056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400442664 is a wasteful number, since it uses less digits than its factorization.

400442664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16685120 (or 16685116 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 400442664 is about 20011.0635399521. The cubic root of 400442664 is about 737.0779975469.

Adding to 400442664 its reverse (466244004), we get a palindrome (866686668).

The spelling of 400442664 in words is "four hundred million, four hundred forty-two thousand, six hundred sixty-four".